[FATAL_ERROR] Cannot start Maven: No valid Maven installation found. Either
关于此问题本人（无期-瑶瑶）非常的尴尬。 在创建maven工程时,Maven home directory时没有选中自己的maven目录 ...
原文：[FATAL_ERROR] Uncaught PDOException: There is already an active transaction
FATAL ERROR Uncaught PDOException: There is already an active transaction 。。。 mysql gt beginTransaction 出现这个错误就是事务嵌套了。意思就是本来一段代码中已经开启了事务处理， 然后在这段代码中又写多了一个事务，同时开启了两个事务处理就会冲突。 ...
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